Magento 2 for paymentsense Asap

Hi We're implementing Payment Sense with a Magento website , so we just need someone magento 2 that can get it to work with to help fix this so can start taking payments through this gateway. 3 things to note: 1. have just set up their account but we ran a test transaction and it worked fine 2. We got an error when trying to install the Payment Sense extension through Connect Manager so we manually installed the plugin, it can be seen here: [login to view URL] but have been told need magento 2 wich they dont offer. 3. The website gets high amounts of orders so please be aware as users will try and place an order using this method if they see it on checkout, so we have to keep it enabled for very short periods of time We believe we have entered all the details correctly so we're not sure why we get this error. We need someone who has experience with Payment Sense to fix the issue ASAP. Thanks!